Screw plug for plastic walls



7 Del. 11,1932, cum 1,881,973

SCREW PLUG FOR PLASTIC WALLS Filed Dec. 31.1930

= Mlalsnr mvmrdn.

' A TTORNEY.

ALFRED SQHMFFF.

Patented Oct. .11, 1932 ALFRED scrmrr'r, or CINCINNATI, OHIO In buildingconstruction,

'made of pl usually is a 'scnnw PLUG r03. PLASTIC WALLS I Applicationfiled December 1,1930. Serial No. 505,843.

many walls are aster board or wall board, which plastic or fibermaterial on which it is extremely diflicult to attach objects withanydegree ity of the wall board to of permanency, due to the inabilholdscrews 'or nails.

The object of the present invention is to provide a hollow plug which isfirmly held to both sides of the wall, in which suitable screws may bereceived to secure or support any object it is desired to attach to thewall. A further object is to provide the plug with means for expandingthe portion of the plug extending through the wall and drawing the endof the plug inwardly.

further object is to provide means for ' anchoring the plug in the wall.v

' Still further objects reside in the novel means employed for attachingthe plug to the wall and in the novel construction of parts.

' The invention will be further readily understood from the followingdescription and claims, and from the drawing, in which latter:

A broken aw thereto;

- Fig. 2 is taken Fig. 4 is Fig. 5 'is 35 6 is the same. 1

Fig. 1 is a in the plane of the line Fig. ,3 is a similar view, with thetube ex panded and in clamped position;

front view of a wall partly a horizontal section of the same, 2-2 ofFig. 1';

a rear view of the same;

an enlarged cross-section of the 5- 5 'ofFig. 2, and

an enlarged perspective view of My invention is particularly adapted tobe used in connection withwalls made of fibrous or plastic materialsalthough it a; in connection with In the drawing, composed of outer maybe used any type of wall.

I have shown .a wall 11 layers 12 of fibrous material securedto aplastic material 13.

My device comprises a tubular member 14 5 provided with to'the tube.

flanges l5 bent at right angles Opposite ends of the flanges havepointed engaging'spurs 16. The other end of the tube has the end cut ona spiral and bent inwardly to form a thread 17. A

*- plurality o f slots 18 are cut into the tubular with my inventionapplied Y at their outer ends, said tubular mem er beand bent inwardlyto form plurality of slots member, havingenlarged openings 19intermediate the length of the slots to form weakened portions 20 in'tlmtube.

In applying my device to-a wall, a hole is drilled through the wall topermit insertion of the tubular shank. The spurs 16 are imbedded in thewallto prevent the tube from turning. A screw 26 engages the threadedend 117.. Rotation of the screw will draw the end ofthe tube inwardlycausing it to bend at the weakened portion 20 forming anchoring arms-27.The screw is then removed and any desired object can be attached to thewallby means of a similar Having thus fully described my inven- 7 tion,what I claim as new and desire to secure by Letters Patent, is:

1. In adeviceef the character described, 7

comprising a tubular member, flanges bent crosswlse thereof at one endand havln spurs 7 ing spirally cut and-bent inwardly to form a thread atthe other end, a series of slots lengthwise said tubular. member forming'2. In a device of the character described,

strips therebetween and means for bulging said strips outwardly.

comprising a tubular member provided with end and being spirally cutflanges at one a threaded ortion at the other end, spurs extending romsaid flanges toward said tubular member, a extending. lengthwise saidtubular member, a screw extending through said tubular member engagingsaid' threaded end'for expanding said tubular member adjacent saidslots.

3. In a device of the character described comprising a tubular member,one end 9 said tubular member provided with flanges bent at right anglesthereto, engaging spurs extending from said flanges, the other end ofsaid tubular member being'spirally cut and bent inwardly to form a.thread, said tubular member provided with slots extenda ing lengthwisethereof forming strips in said member, said strips having weakenedportions intermediate their length, means for drawing said threadedportion inwardly causing said stri s to bulge outwardly for loeking saidmem r to a wall. In testimony whereof, I have hereunto signed my name.

ALFRED SCHMITT;

